And fans have been paying touching tributes to Richard, believed to have been on his way back from seeing his side draw 1-1 with Fulham in a pre-season friendly.

Taking to a fan forum for Crystal Palace fans, one wrote: "Needless tragedy for family, friends and work colleagues concerned.

"Heartfelt condolences to all nearest and dearest."

And on Twitter, fan Sam Peters said: "No one deserve [sic] to go to a game and not make it home."

Detective Superintendent Gary Richardson, leading the investigation, said: "We are keen to hear from anyone who witnessed an altercation involving three men on the main concourse of Victoria mainline station at approximately 7.35pm on Saturday, 1 August.

"Any information, no matter how small or seemingly insignificant, could prove crucial to the investigation."